For anyone who has this, how soon into the game did you change the difficulty?

I'm doing a second play through, and switched it a few minutes in, while chasing what's his name through the cannery, before meeting Augustine. Will that work, our do I need to go back and switch earlier?

That might not work, but I don't know for sure. It's best to change difficulty in your first game, and then start a new game from it, that will begin the new one on Expert.

I changed it while chasing him as well, or at least not the very first scene of the game, and got the trophy.

It may not matter until your first combat scenario because I've heard if you start on Normal and do good enough in the game's tutorial it'll give you a prompt suggesting Hard mode?

I found myself screwed by this just last night. I made it up to the Space Needle mission on my second playthrough and realized I was still on Normal difficulty. I looked it up on PS3Trophies and it was pretty clear that it was too late to switch, had to start over.

What I ended up doing was going to my regular game, turning the setting up then starting a new game. It starts out on that setting then.